CN216903012U

CN216903012U - Lithium ion battery current collector with good adhesion capacity and lithium ion battery

Info

Publication number: CN216903012U
Application number: CN202123354504.8U
Authority: CN
Inventors: 范海满; 师贵荣; 李朗阁; 肖文杰; 黄崇智
Original assignee: Shenzhen Honcell Energy Co ltd
Current assignee: Shenzhen Honcell Energy Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-07-05
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a lithium ion battery current collector with good adhesion capacity and a lithium ion battery comprising the current collector. The lithium ion battery current collector with good adhesion capability and the lithium ion battery comprising the current collector have the characteristics of strong adhesion, good ductility and excellent electrical property.

Description

Lithium ion battery current collector with good adhesion capacity and lithium ion battery

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery current collector with good adhesion capacity and a lithium ion battery comprising the current collector.

Background

In the preparation process of the positive and negative pole pieces of the lithium ion battery, the positive active material or the negative active material is mainly prepared into slurry, then the slurry is coated on a current collector, and then the pole pieces are prepared by drying, rolling and stripping. Currently, the current collector of the positive electrode is mainly aluminum foil. The rough surface with dendrites impairs electrical performance and is not easy to coat. In practice, current collectors using double-sided light are many. However, in the coating process of the double-sided smooth current collector, the binding capacity of the active material layer and the surface of the current collector is relatively general, and the hidden danger of the falling-off of the active layer is also generated in the subsequent rolling process, so that the consistency of the battery is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a lithium ion battery current collector with good adhesion capability and a lithium ion battery comprising the current collector, and the lithium ion battery current collector has the characteristics of strong adhesion, good ductility and excellent electrical property.

The utility model can be realized by the following technical scheme:

the utility model discloses a lithium ion battery current collector with good adhesion capacity, which comprises a current collector body, wherein the positive surface of the current collector body is provided with a first stripe region, the negative surface of the current collector body is provided with a second stripe region, and the first stripe region and the second stripe region have different stripes.

Furthermore, the first stripe region and the second stripe region are both regular lines, and the regular lines are parallel transverse lines, parallel longitudinal lines or parallel inclined lines. And regular lines are adopted, so that the appearance control is simple and convenient, and the processing consistency control is convenient.

Furthermore, the first stripe region and the second stripe region are both irregular grains, and the irregular grains are stripes or holes. The irregular lines can be subjected to shape control by adopting a template, although the control of the regular lines is relatively complex, the interface binding points are more, the binding capacity and the ductility are stronger, and the requirement of high compaction is met.

Furthermore, the first stripe area and the second stripe area are arranged in a staggered mode, and a non-stripe area is arranged between the two staggered and adjacent first stripe areas and second stripe areas. Through setting up no line district, form mass flow body buffer area for the pole piece roll-in, avoid excessive pressure and fragile piece.

Further, the current collector body is a positive current collector or a negative current collector, the positive current collector is an aluminum foil, and the negative current collector is a copper foil.

Further, a positive electrode material layer or a negative electrode material layer is attached to the surface of the current collector body.

Further, the positive electrode material layer is a lithium iron phosphate material layer, a lithium manganate material layer, a lithium cobaltate material layer or a ternary material layer, and can be specifically selected by combining the types of the batteries.

Further, the negative electrode material layer is an artificial graphite material layer, a natural graphite material layer, an intermediate phase carbon microsphere material layer or a silicon carbon material layer, and can be selected specifically according to the type of the battery.

Another aspect of the present invention is to protect a lithium ion battery using the above current collector.

The lithium ion battery current collector with good adhesion capacity and the lithium ion battery comprising the current collector have the following beneficial effects:

the binding force is strong, the first stripe area and the second stripe area are respectively arranged on the female surface and the male surface of the current collector, the roughened contact area of the active material layer and the surface of the current collector is realized, and the adhesion and the cohesiveness between the active material layer and the current collector are improved;

secondly, the ductility is good, different grains are arranged in the first stripe area and the second stripe area, and stress dispersion in different directions is formed in the rolling process of the pole piece, so that the condition of excessive rolling caused by excessive concentration of stress in a certain area of the current collector is avoided, and the brittle sheet is avoided;

and compared with the traditional rough surface structure, the current collector structure disclosed by the utility model has the advantages that the influence of dendrites on the electric performance is avoided, and the combination capability of the active material layer and the surface of the current collector is effectively ensured to improve the electric performance.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment 1 of a lithium ion battery current collector with good adhesion capability according to the present invention;

fig. 2 is a schematic structural diagram of an embodiment 2 of a lithium ion battery current collector with good adhesion capability according to the present invention;

fig. 3 is a schematic structural diagram of an embodiment 3 of a lithium ion battery current collector with good adhesion capability according to the present invention;

fig. 4 is a schematic structural diagram of an embodiment 4 of a lithium ion battery current collector with good adhesion capability according to the present invention;

the reference numbers in the drawings include: 100. a current collector body; 210. 230, a first striation zone; 220. 240, a second striated area; 310. a positive electrode material layer; 320. and the negative electrode material layer.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the following detailed description of the present invention is provided with reference to the accompanying drawings.

Example 1

As shown in fig. 1, the present invention discloses a lithium ion battery current collector with good adhesion, which includes a current collector body 100, wherein the positive surface of the current collector body is provided with a first stripe region 210, the negative surface of the current collector body is provided with a second stripe region 220, and the first stripe region 210 and the second stripe region 220 have different stripes.

Specifically, the first stripe region 210 and the second stripe region 220 are both regular lines, and the regular lines are parallel horizontal lines, parallel longitudinal lines or parallel inclined lines.

Meanwhile, in order to effectively ensure that the current collector body has better ductility during rolling, the first stripe regions and the second stripe regions are arranged in a staggered manner, and a non-stripe region is arranged between the two staggered and adjacent first stripe regions and second stripe regions.

In a specific type, the current collector body is a positive current collector, specifically an aluminum foil, and a positive material layer 310 is attached to the surface of the current collector body, and the positive material layer is a lithium iron phosphate material layer, a lithium manganate material layer, a lithium cobaltate material layer or a ternary material layer. Naturally, this pole piece is the positive pole piece.

Example 2

As shown in fig. 2, the present invention discloses a lithium ion battery current collector with good adhesion capability, which includes a current collector body 100, wherein the positive surface of the current collector body 100 is provided with a first stripe region 230, the negative surface of the current collector body 100 is provided with a second stripe region 240, and the first stripe region 230 and the second stripe region 240 have different stripes.

Specifically, the first stripe region 230 and the second stripe region 240 are both irregular lines, and the irregular lines are stripes or holes.

Example 3

As shown in fig. 3, the present invention discloses a lithium ion battery current collector with good adhesion capability, which includes a current collector body 100, wherein the positive surface of the current collector body 100 is provided with a first stripe region 210, the negative surface of the current collector body 100 is provided with a second stripe region 220, and the first stripe region 210 and the second stripe region 220 have different stripes.

In a specific type, the current collector body is a negative current collector, specifically a copper foil, and a negative material layer is attached to the surface of the current collector body, wherein the negative material layer is an artificial graphite material layer, a natural graphite material layer, an intermediate phase carbon microsphere material layer or a silicon carbon material layer. Naturally, the pole piece at this time is a negative pole piece.

Example 4

As shown in fig. 4, the present invention discloses a lithium ion battery current collector with good adhesion capability, which includes a current collector body 100, wherein the positive surface of the current collector body 100 is provided with a first stripe region 230, the negative surface of the current collector body 100 is provided with a second stripe region 240, and the first stripe region 230 and the second stripe region 240 have different stripes.

In a specific type, the current collector body is a negative current collector, specifically a copper foil, and a negative material layer 320 is attached to the surface of the current collector body, and the negative material layer is an artificial graphite material layer, a natural graphite material layer, an intermediate phase carbon microsphere material layer or a silicon carbon material layer. Naturally, the pole piece at this time is a negative pole piece.

In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the utility model.

Claims

1. The utility model provides a lithium ion battery mass flow body that adhesive force is good, includes the mass flow body, its characterized in that: the positive side of mass flow body is equipped with first stripe district, the negative side of mass flow body is equipped with second stripe district, first stripe district with the line in second stripe district is different.

2. The lithium ion battery current collector with good adhesion capability of claim 1, wherein: the first stripe region and the second stripe region are both regular grains, and the regular grains are parallel transverse grains, parallel longitudinal grains or parallel inclined grains.

3. The lithium ion battery current collector with good adhesion capability of claim 1, wherein: the first stripe area and the second stripe area are both irregular grains, and the irregular grains are stripes or holes.

4. The lithium ion battery current collector with good adhesion capability according to claim 1 or 2, wherein: the first stripe area and the second stripe area are arranged in a staggered mode, and a non-stripe area is arranged between the two adjacent staggered first stripe areas and the second stripe areas.

5. The lithium ion battery current collector with good adhesion capability of claim 4, wherein: the current collector body is an anode current collector or a cathode current collector, the anode current collector is an aluminum foil, and the cathode current collector is a copper foil.

6. The lithium ion battery current collector with good adhesion capability of claim 5, wherein: and a positive electrode material layer or a negative electrode material layer is attached to the surface of the current collector body.

7. The lithium ion battery current collector with good adhesion capability of claim 6, wherein: the positive electrode material layer is a lithium iron phosphate material layer, a lithium manganate material layer, a lithium cobaltate material layer or a ternary material layer.

8. The lithium ion battery current collector with good adhesion capability of claim 7, wherein: the negative electrode material layer is an artificial graphite material layer, a natural graphite material layer, an intermediate phase carbon microsphere material layer or a silicon carbon material layer.

9. A lithium ion battery using the lithium ion battery current collector of any of claims 1-8.